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Preconditioned wire array Z-pinches driven by a double pulse current generator

Jian Wu, Yihan Lu, Fengju Sun, Xingwen Li, Xiaofeng Jiang, Zhiguo Wang, Daoyuan Zhang, Aici Qiu, Sergey Lebedev2018年Plasma Physics and Controlled FusionIF 2.2出版社

Suppression of the core-corona structure and wire ablation in wire array Z-pinches is investigated using a novel double pulse current generator 'Qin-1' facility. The 'Qin-1' facility allows coupling a ∼10 kA 20 ns prepulse generator with a ∼0.8 MA 160 ns main current generator. The tailored prepulse current preheats wires to a gaseous state and the time interval between the prepulse and the main current pulse allows formation of a more uniform mass distribution for the implosion. The implosion of a gasified two aluminum-wire array showed no ablation phase and allowed all array mass to participate in the implosion. The initial perturbations formed from the inhomogeneous ablation were suppressed, however, the magneto Rayleigh–Taylor (MRT) instability during the implosion was still significant and further researches on the generation and development of the MRT instabilities of this gasified wire array are needed.

日本語訳

ワイヤアレイZピンチにおけるコア・コロナ構造とワイヤアブレーションの抑制を、二重パルス電流発生装置「Qin-1」を用いて調査した。「Qin-1」装置は、約10 kA・20 nsのプレパルス発生器と、約0.8 MA・160 nsの主パルス発生器を結合することを可能にする。調整されたプレパルス電流はワイヤを気体状態まで予備加熱し、プレパルスと主パルス電流の間の時間間隔は、より均一な質量分布の形成を可能にして爆縮に寄与する。気化した2本のアルミニウムワイヤアレイの爆縮は、アブレーション相を示さず、全アレイ質量が爆縮に参加することを可能にした。不均一なアブレーションから形成される初期摂動は抑制されたが、爆縮中の磁気レイリー・テイラー(MRT)不安定性は依然として顕著であり、この気化したワイヤアレイにおけるMRT不安定性の発生と発展に関するさらなる研究が必要である。

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